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Has anybody a good example for a pawn-promotion to bishop?
I found one yesterday in German chess-magazine "Schach".
I will post it in the next days. (Just forgot to bring it to work)
Earlier I was sure that there's NO reason for a pawn to promte to bishop.
In this game I will post it is the easiest way to win. But not the only.
It is a grandmaster game. (the one with 2600+ lost against 2400+)

jsnyder: I think the point to the question was not whether promoting to bishop would be sufficient, but whether promoting to queen would be detrimental whereas bishop would be beneficial.

Gregorgysi: I'm going to have to play out your scenario on a board because when I go through it mentally trying to follow your depiction, I don't see how your 1...c1Q scenario with 2. Rxg7+ Kxg7 3.Qg5+ leads to stalemate where c1B would not if white followed the same moves...[/i]

I too have always thought that Knight would be the only potential piece to provide benefit over a Queen, and then only in very strange circumstances. I would have always thought that R or B could always be sufficed through a Q.

Here's a "miniature" example of where promotion to rook is the only winning move:

White to move.

If White moves the king, black plays Kg7 and then captures the pawn next move -- draw.
If White promotes to queen, stalemate -- draw.
If white promotes to bishop or knight, insufficient mating material -- draw.
If white promotes to rook, however, Black must play Kg7, then white plays Rf1 or the like and goes on to mate with king and rook vs. king.